We wrote about the upcoming iPhone game Tap Tap Revenge 3 earlier this week – it’ll offer paid song downloads from UMG, among other labels. Now its developer, Tapulous, has revealed more details. Due to launch in July, the song downloads will be sold in 2-for-$1 bundles. Meanwhile, players will be invited to design their own background art and themes, while the game may be opened up for indie bands to submit their songs too. Tapulous has also revealed that it’s sold more than 300,000 of its premium Tap Tap Revenge spin-off games, and has generated around $1.5 million in revenue since last Summer.